It was one of the moves that saw tensions spiral this month, along with a new set of UN Security Council sanctions, US President Donald Trump's apocalyptic warning to rain "fire and fury" on Pyongyang, and culminating with the North firing a missile over Japan on Tuesday.
Yonhap cited the South Korean defence ministry as saying the latest launch was done to showcase Pyongyang's improved nuclear capabilities and warned that North Korea could detonate a nuclear bomb any time at its Punggye-ri site.
USA and allied radar systems can quickly determine where a missile is headed and whether it poses a threat to populated areas.
The council expressed its commitment to a peaceful, diplomatic and political solution to the situation and welcomed efforts to facilitate a peaceful and comprehensive solution through dialogue. U.S. military experts can continue to search for preventive options - or any option that will avoid triggering a process of mutual escalation leading to a major military exchange or war.
The North incited global alarm on Tuesday when it fired an intermediate-range missile over Japan, triggering condemnation from the UN Security Council and world leaders including the United States and Britain.
Not long after, Mattis explained that the U.S.is "never out of diplomatic solutions", leading many reporters to conclude that he and Trump are not on the same page when it comes to North Korea, one of the most serious global security threats the U.S.is presently addressing.
That follows on five straight years of budgetary increases as territorial tensions with China also aggravate Japan's security concerns.
"We will continue developing ballistic missile defense technologies to stay ahead of the threat as it evolves", said Lieutenant General Sam Greaves, the director of the U.S. Missile Defense Agency.
The plan involves "the mobilisation of airborne troops and Marines to infiltrate Pyongyang to quickly bring down the North Korean regime". -South Korea military exercises, which the North views as rehearsals for an invasion.
Rycroft said one area would be to build upon the cap on foreign laborers, saying: "We could do more to prevent the flow of money coming into the DPRK from North Korean nationals who are working overseas".
May's official meetings with Abe and other Japanese officials are scheduled for today in Tokyo.
Japan has in the past vowed to shoot down North Korean missiles or rockets that threaten to hit its territory, and deployed its Patriot missile defense system in response to the Guam threat, reports and officials said, with an Aegis destroyer also stationed in the Sea of Japan.